Pacific Sunwear of California Inc (Nasdaq:PSUN), specialty retailers of everyday casual apparel, accessories and footwear, has announced the appointment of William Estill to the position of vice president of planning and allocation. Estill has more than 25 years of experience in retail, most recently as vice president of planning and allocation for Cato Stores for eight years and prior to that, two years as vice president of corporate planning for Seiferts Stores.